Oxygen sensor?

[yernkie]

Does anyone know of a company that makes handheld oxygen sensors for tuning a quad?

[rt20ps]

http://www.innovatemotorsports.com/products/lm2.php

[Claas900]

www.zeitronix.com is good also

dang I wanted to buy one but I could take my quad to a dyno to get the same thing about 10 times for the price of 1 of those.